Why Some People Digest Everything — And Others Don’t

You've probably sat at the same dinner table as someone who can polish off a hearty curry, a pint of lager, and a generous slice of sticky toffee pudding…and feel absolutely fine afterwards. Meanwhile, you're quietly dreading the bloating, the urgency, or the uncomfortable heaviness that tends to follow your own meals. Sound familiar? You're far from alone.

Digestive differences between people are real, they're significant, and crucially, they're not simply a matter of willpower or "having a sensitive stomach." The science behind why some people digest everything with ease, whilst others struggle daily, is genuinely fascinating. And understanding it might just change how you think about your gut health altogether.

It Starts With Your Gut Microbiome

Your digestive system is home to trillions of microorganisms - bacteria, fungi, and other microbes that collectively form your gut microbiome. This ecosystem is entirely unique to you, shaped by everything from how you were born and whether you were breastfed, to your diet, stress levels, medication history, and even your genetics.

When your microbiome is well-balanced, rich in diverse, beneficial bacteria, your gut tends to function smoothly. Food is broken down efficiently, nutrients are absorbed properly, and your digestive system communicates well with the rest of your body, including your brain and immune system.

But when that balance is disrupted, a state known as dysbiosis, things can go wrong… Harmful bacteria can begin to dominate ^[2]. The gut wall becomes more permeable. Inflammation creeps in. And suddenly, foods that once caused no trouble start triggering bloating, discomfort, constipation, or urgency.

Why Does Dysbiosis Happen?

Several everyday factors can tip your gut microbiome out of balance:

• Diet plays perhaps the biggest role ^[2]. A diet high in ultra-processed foods, refined sugars, and low in fibre starves beneficial bacteria while feeding less desirable ones. Conversely, a varied, plant-rich diet supports diversity and resilience in the microbiome.
• Antibiotics, whilst sometimes life-saving, are well known to disrupt gut bacteria, wiping out harmful and beneficial strains alike ^[2]. Even a single course can alter the microbiome for months, and repeated use compounds the impact significantly.
• Stress is another major culprit. Through the gut-brain axis, chronic psychological stress can directly alter gut motility, gut permeability, and microbial composition ^[3].
• Age and hormonal changes also matter. Women, in particular, experience significant fluctuations in oestrogen and progesterone throughout life, both of which influence gut motility and bacterial composition ^[4]. It's no coincidence that conditions like irritable bowel syndrome (IBS) disproportionately affect women.

The Enzyme Question

There's another layer to this story that doesn't get nearly enough attention: digestive enzymes.

Your body produces a range of enzymes specifically designed to break down the food you eat; amylases for carbohydrates, proteases for proteins, lipases for fats. When these enzymes are present in adequate quantities and functioning well, food is broken down in the upper gut before it reaches the lower gut, where bacteria reside.

But when enzyme activity is insufficient, partially digested food travels further down the digestive tract and begins to ferment. This fermentation produces gas, disrupts the microbial balance, and feeds the wrong kinds of bacteria, contributing to bloating, discomfort, and irregular bowel habits.

This is one of the core reasons why two people can eat exactly the same meal and have completely different experiences afterwards. It isn't just about what you eat, it's about how well your gut processes it.

Why Probiotics Aren't Always the Answer

When people experience digestive problems, the first thing many reach for is a probiotic supplement. And whilst probiotics have their place, the science around long-term, unsupervised probiotic use is more nuanced than most marketing would suggest.

A peer-reviewed study published in the Journal of Functional Foods examined the effects of long-term probiotic supplementation in a rat model over a period equivalent to approximately 13 years in human life ^[1]. The findings were striking. Long-term supplementation resulted in a systemic pro-inflammatory response, with elevated levels of inflammatory cytokines including TNF-α, IL-1β, and IFN-γ. Cardiovascular risk indicators (specifically lipoprotein ratios) were significantly elevated. Changes in faecal microbial composition included increased abundance of bacterial families associated with gastrointestinal inflammation and conditions including diabetes and stroke ^[1].

Importantly, the study concluded that "the use of probiotics for preventive reasons should also be tested as the long-term use by healthy individuals might in certain cases lead to a gradual health deterioration" ^[1]. The researchers called for a shift away from the current "one-size-fits-all" approach, towards person-specific, condition-tailored interventions with defined treatment periods.

This isn't to say probiotics are harmful when used appropriately. But it does raise serious questions about the wisdom of taking live bacteria supplements indefinitely, without clinical guidance, which is precisely what millions of people do every day.

A Different Approach: JUVIA and ERME™

This is where JUVIA takes an entirely different path…and it matters!

JUVIA is not a probiotic. It does not introduce foreign bacteria into your gut. Instead, it works with your body's own digestive processes using ERME™ (Enzyme Rich Malt Extract), a natural ingredient derived from sustainable barley and backed by over a decade of research.

ERME™ contains more than 15 naturally occurring enzymes that work in the upper gut to break down food - particularly complex carbohydrates - before it reaches the lower gut, where fermentation and microbial disruption tend to occur. By addressing the problem upstream, JUVIA helps prevent the conditions that lead to bloating, discomfort, and digestive irregularity in the first place.

Because JUVIA supports your gut's own environment rather than flooding it with external bacterial strains, it works to rebalance your unique microbiome, promoting the beneficial bacteria your gut already hosts, whilst reducing the harmful ones. This is a fundamentally different mechanism to probiotics, and given the emerging evidence around the risks of long-term probiotic use ^[1], it is a meaningful distinction.

JUVIA's formulation is also naturally rich in Vitamin B12, which supports energy metabolism, reduces fatigue, and contributes to healthy immune function. Through the gut-brain axis, a healthier gut can also support improved mood and mental clarity, benefits that extend well beyond digestion alone.

So Why Can Some People Eat Anything?

The honest answer is: a combination of genetics, microbiome diversity, enzyme activity, lifestyle, and a good deal of luck. People with naturally high microbial diversity, robust enzyme production, low stress levels, and fibre-rich diets tend to digest food more efficiently. Their guts are resilient.

But resilience isn't fixed. It can be built…and it can be lost. Periods of stress, illness, antibiotic use, or poor diet can all erode even a well-established gut environment. The good news is that with the right support, the gut has a remarkable capacity to recover and rebalance.

Supporting Your Gut From the Inside Out

If you're someone who finds digestion a daily challenge - or even just occasional discomfort after meals - it's worth looking beyond probiotics and considering whether your gut is actually getting the enzymatic support it needs.

JUVIA is taken three times daily, just before meals, supporting each digestive cycle from the moment food enters your system. It's vegan, made from natural barley, and produced in Britain, a clean, straightforward supplement for a complex problem.

Better digestion isn't about overhauling your life overnight. It's about understanding what your gut actually needs, and giving it the right kind of support.